Electric apparatus.



c, LE s. P fmIEslcuE. ELECTRIC ARPARUS. APPLICATION FILED JULY-6.119%.

I Patented June 29, 1915.'

; gE-NTOR I' ATT'OHNEY l To all 'whom t muy concern:

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Be i known that I, CHAR-Les Le G. Fon` TEsCUn, a subject of the King Great Brit` ain, anda resident of Wilki1isbur"f,'in the county of Allegheny and :St-ate ofv ennsyl- Vania, 'have invented a new and useful lmprovement in- Eleetric Apparatus, offwhich 'the following is a specii'iation.

My invention relates to insulators and insulating bushings which are adapted for supporting and separating the conducting leads of transformers and other eleetric de vices from the casings in' which they are contained.

' The object of my inventionis vto;prmjide an improveddevice of .the class above indicated that shall he relatively compact and.

particularly adapted for use with very highvolta'ge conductors. Y n l lVarious. electrical devices, of which. highvoltage transformers l are well known ex'-l amples, are immersed in oil or other insulating-fluid contained in casings or tanks constructed of conducting material. 'The 1nsulating sleeves or bushings through which the high-voltage leads arethreaded are, as ordinarily constructed, very large and hea vy and liable to injury in transportation.

According to my present invention, I provide a hollow sleeve or hushing which may preferably have thegeneral Jlorni of a. tube .and be carefully sealed .at its upper 'extremity vand supported at an intermediate point by the cover plate of the transformer. tank or casing through which it extends, the

'lower end being perforated and .submerged inthe oil or other insulating Huid contained in the transformer tank. The hollow hushing is empty while itis being transported or assembled but during the operation of :the device with which it is associatedl the air lis exhausted from the upperA end of the sealed bushing and, since the lowerend is submerged moll, the atmospheric pressure in the tank will force oil into the bushing and thereby materially improve its insu# lating properties.

The single ligure of the accompanying drawing is a partially sectional eleva-tion of ysp@ilumina er Letters raient assumeva-'ana my s, ieee. saisine. nasce.

Patented 'June 229, 1915.

a core member 1, a winding 2, and conducting leads S and 3, a'casin'g or tank l c0ntaining oil or other suitable insulating Huid in which the transformer is immersed and a plurality of insulating bushings 5 and 6 surrounding the leads and extending through and supported by a cover 7 of the tank.

Each. of 4the bushings comprises a sleeve or tube 8, having heads 9 and 10 which are carefully sealed into the ends of the tube and complete the inelosing walls of a charnher ll formed between theleads 3' andthe tube. The upper' end of the chamber l1 CHARLES' Ln sr.- ronrsseun, or wrnniiissune, @einsenden-ria; `'assis-iniis; "BY Miseria ammenda To Wssrrarenousn ni-acrsm a nanuracrunms 'coa-irene; -o

must ce air tight but the lower end extends bushing is of special advantage for use in liigli-voltage testing transformers where the service is intermittent, the volt-1 .age being very high and the transformer frequently under the care of an attendant.

After the oil lerel in the bushing has been raised to the desired height by exhausting the air from the top oi the chamher 11, a' valve 14 in the tap 13 may be closed and the pipe l5 removed, the oil level being maintained constant, except for slight variations due to lealnige7 until the valve is again opened.

l t will he readilyA understood that niy-improved insulating bushing is not restricted in its use to transformer leads and that it may he employed for various purposes Within the scope of my invention.

l claim as my invention: i. The combination with a container and a 'body of' liquid disposed therein, of an insulating bushing for electrical apparatus projecting both upwardly and downwardly through an aperture in the container cover and comprising a casing having a perforated lower end which is immersed in the liquid, and an air valve adapted to coperatie with air-exhausting apparatus in order to remove' which 1s perforated and adapted to przlject into the insulating liquid, and a valve adpted to coperate with exhausting apparatus to remove the air contained Within the casing and thereby effect displacement-of the 4 air in said casing by a portion of said insulating liquid.

ling tank provided with an opening and adapted to receive an electrical apparatus,

' 3. The -combination with 'a fluid-containof an insulating bushing therefor comprising a hollou7 casing'ivhich projects bothf'up- Wardly anddownwardly through s aid opening, the upper end of the casing being sealed and the lower end being adapted to project into a body of liquid contained in said tank Vand being provided with at least one opening to permit ingress and egress of -the liquid.

@The combination with a fluidcntaining tank provided with a hollow insulating extension through which an electric conducting lead extends, the outer end of said eX- @tension being sealed and the inner end being open and immersed in the fluid in said tank, of means for exhausting air from said extension, whereby the level ofthe fluid contained therein may be raised above that of the fluid i-n the containing tank.

5. In electric apparatus, the combination u with a casing and a liquid therein, of a hollow insulating bushing for a conducting lead sealed at one end and immersed in the liquid at the other end, and a valve adapted to cooperate With lair-exhausting apparatus in -Y 7. In an electrical apparatus,

order that 4the air in said bushing may be displaced'by a portion of the liquid 1n said casing.

6. The combination with a tank containing a body of insulating liquid, of an electrical apparatus immersed in'said liquid and having terminal conductors, insulating tubes for said terminal conductors'that project through apertures formed in the tank and into said liquid `and have openings beneath the surface thereof, and means for permit ting egress of the air from said tubes in order that is may be replaced by said liquid when the apparatus is in use. Q the combination with a containing tank and a fluid diSr posedtherein, of a hollow-,insulating bushing through which a conducting lead extends, said bushing being sealed at one end immersed in said fluid, and an air valve to permit egress of the air contained 1n said bushing'.

8. The combination with a container provided Withan aperture, an insulatingbushing comprising a hollow casing which' l1s and open at the other, the open end being seated in said aperture and projects both' I inwardly and outwardly therefrom, said casing having a sealed outer end and a perforated inner end, a body ofy insulatingliquid in which the perforated end of said casing is submerged, and means for with-v drawing air fronr the outer 'end of-,said' casing. 1

In testimony whereof, 1 have hereunto subscribed my name this 30th day of June, 1908.

CHARLES Ln e. roRTEs'cUn.

Witnesses: v l A.

W. M. ,MCCONAHEL BIRNEX Hines. 

